202122003121 has 4 divisors (see below), whose sum is σ = 205435478644. Its totient is φ = 198808527600.

The previous prime is 202122003119. The next prime is 202122003169. The reversal of 202122003121 is 121300221202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30364805025 + 171757198096 = 174255^2 + 414436^2 .

It is a cyclic number.

It is not a de Polignac number, because 202122003121 - 2¹ = 202122003119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202122003095 and 202122003104.

It is not an unprimeable number, because it can be changed into a prime (202122003101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656737670 + ... + 1656737791.

It is an arithmetic number, because the mean of its divisors is an integer number (51358869661).

Almost surely, 2^202122003121 is an apocalyptic number.

It is an amenable number.

202122003121 is a deficient number, since it is larger than the sum of its proper divisors (3313475523).

202122003121 is an equidigital number, since it uses as much as digits as its factorization.

202122003121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313475522.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 202122003121 its reverse (121300221202), we get a palindrome (323422224323).

The spelling of 202122003121 in words is "two hundred two billion, one hundred twenty-two million, three thousand, one hundred twenty-one".